{"id":206,"date":"2023-04-01T12:41:51","date_gmt":"2023-04-01T12:41:51","guid":{"rendered":"http:\/\/localhost\/solvefor2\/?p=206"},"modified":"2023-04-01T12:21:19","modified_gmt":"2023-04-01T12:21:19","slug":"uace-physics-paper-two-joint-mock-examinations-2019","status":"publish","type":"post","link":"https:\/\/edu.co.tz\/notes\/uace-physics-paper-two-joint-mock-examinations-2019\/","title":{"rendered":"UACE PHYSICS PAPER TWO JOINT MOCK EXAMINATIONS 2019"},"content":{"rendered":"

P510\/2
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PHYSICS
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PAPER 2
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July\/August 2019
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21<\/sup>\/2<\/sub>hours<\/span>
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UGANDA ADVANCED CERTIFICATE OF EDUCATION
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JOINT MOCK EXAMINATIONS 2019
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PHYSICS PAPER TWO P510\/2
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2hours 30minutes
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INSTRUCTIONS TO CANDIDATES
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Answer five<\/strong> questions, including at least one<\/strong> from each section, but not more<\/strong> than one<\/strong> from any of the sections A and B.
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Where necessary assume the following constants:
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Acceleration due to gravity, g = 9.81ms-2
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Speed of light in vacuum, c = 3.0 x 108<\/sup>ms-1
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Speed of sound in air v = 340ms-1<\/sup>
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Electronic Charge, e = 1.6 x 10-19<\/sup>C
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Electronic mass, me<\/sub> = 9.1 x 10-31<\/sup>kg
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Permeability of free space, \u03bc0<\/sub> = 4.0\u03c0 x 10-7<\/sup>Hm-1
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Permittivity of free space, \u03b50<\/sub> = 8.85 x 10-12<\/sup> Fm-1<\/sup>
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The Constant, = 9.0 x 109<\/sup>F-1<\/sup>m
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SECTION A
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1. (a) Define focal plane focal<\/em> and power of<\/em> a lens. (2)
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(b) (i) Describe an experiment to determine the focal length of a concave lens using a concave
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mirror. (5)
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(ii) Explain why monochromatic light is usually preferred in experiments when using
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lenses. (2)
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(c) A concave lens of focal length 30cm is arranged coaxially with a convex lens of focal length 18cm, placed 4cm apart. An object 3cm high is placed 40cm in front of the concave lens, on the side remote from the convex lens. Find the:
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(i) position of the final image (5)
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(ii) height of the image. (2)
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(d) With the aid of a diagram describe how prism binoculars work. (4)
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2. (a)(i) Define refractive index<\/em> of a material. (1)
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(ii) Derive the expression for the refractive index of a material of a prism in terms of the refracting angle, A, and angle of minimum deviation, D. (4)
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(iii) When light is incident on a prism of refractive index 1.52, at an angle of incidence 360<\/sup>, the emergent ray makes angle 54.30<\/sup> with the normal on the opposite face. Find the angle of incidence for minimum deviation. (4)
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(b) Describe how the refractive index of a liquid may be determined using an air cell. (5)
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(c) (i) Explain why we are able to see the sun before sun rise. (3)
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(ii) Explain why a vertical pole near the observer appears taller than one of equal height placed farther away. (3)
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SECTION B
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3. (a) (i) What is Doppler effect? (1)
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(ii) A source of sound moving with velocity, us<\/sub><\/em>, approaches an observer moving with velocity, uo<\/sub><\/em>, in the same direction. Derive the expression for the frequency of the sound heard by the observer. (4)
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(iii) Explain what happens to the pitch of the sound heard by the observer in a(ii) above when the observer moves faster than the source. (2)
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(b) (i) What is sound? (1)
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(ii) Explain the main factors that determine the velocity of sound in air. (4)
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(c) Explain how beats are formed. (3)
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(d) When two stopped pipes of lengths 62cm, with end corrections of 1.2cm and 1.8cm respectively are sounding their fundamental notes, beats are formed. If the velocity of sound in air is 340ms-1<\/sup>, find the beat period. (5)
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4. (a) What is meant by interference and diffraction with reference to light? (2)
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(b)(i) With the aid of a diagram, explain how Newton’s rings are formed. (5)
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(ii) Explain the change in spacing of rings in b(i) above when the air film is replaced with water. (2)
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(c) An air wedge is formed using two flat glass plates of length 150mm in contact at one end and separated by a thin wire at the other end. When the wedge is illuminated almost normally with monochromatic light of wavelength 570nm, 20 fringes are counted in a distance of 1.85mm. Find the diameter of the wire. (4)
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(d) Describe how the wavelength of light may be determined using a transmission grating. (5)
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(e) Find the angular position for the second order image when light of wavelength 548nm, is made incident normally on a grating of 600 lines per mm (2)
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SECTION C
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5. (a) (i) Define the ampere<\/em>. (1)
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(ii) Describe how the magnetic flux density at the centre of a coil may be determined using a current balance. (5)
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(b) (i) A rectangular coil of, N<\/em>, turns measuring a <\/em>cm by b <\/em>cm is placed in a uniform magnetic field of flux density, B<\/em>. If a current of, I<\/em>, flows through the coil, derive the expression for the magnetic torque experienced by the coil when the normal to the plane of the coil makes angle, \u03b8, with the field. (5)
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(ii) Name two<\/em> devices, and state their functions, whose operations are based on magnetic torque on current carrying conductors. (2)
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(c) A circular coil of 25 turns each of radius 12cm lies on a table. The earth’s magnetic field intensity at the location of the coil is 52.7Am-1 <\/sup>while the angle of dip is 73.00<\/sup>. Find the:
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(i) magnetic flux threading the coil. (4)
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(ii) torque on the coil when a current of 1.5A is passed through it. (3)
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6. (a) What is meant by the following terms:
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(i) self induction? (1)
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(ii) mutual induction? (1)
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(b) Two coils P and Q are placed co- axially near each other as shown in figure below. R is a rheostat of large value while E is a strong battery.
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Explain the following observations:
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(i) When the resistance is varied very fast, the bulb lights up. (2)
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(ii) When coil Q is moved away from P, and the procedure repeated, the bulb lights dimly. (2)
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(c) A transformer whose secondary coil has 72 turns and the primary 900 turns has its secondary connected to a 3\u2126 resistor. If the primary is connected to a 240V a.c supply and assuming the transformer is 90 efficient, calculate the current flowing in the primary. (4) (d) State the laws of electromagnetic induction. (2)
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(e) Describe an experiment to demonstrate Faraday’s law of electromagnetic induction. (4)
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(f) A coil of 80 turns is wound round the middle of a long solenoid of 750 turns per metre and radius 10.0cm. A sinusoidal current I = 7sin(150\u03c0t), is passed through the solenoid. Find the e.m.f induced across the terminals of the coil. (4)
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7. (a) (i) Describe how a hot wire ammeter works. (5)
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(ii) Explain why the instrument in a(i) above is suitable for measuring alternating current while a moving coil galvanometer is not. (3)
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(b) Define reactance and state its unit. (2)
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(c) Show that current leads voltage by phase angle 900<\/sup> when a sinusoidal voltage is applied across a capacitor; hence find the expression for reactance of the capacitor. (4)
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(d) A 240V, 60Hz alternating voltage is applied across an inductor of 0.2H and negligible resistance. Find the maximum value of current that flows through the inductor. (3)
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(e)
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An iron cored coil L is connected in series with a resistor and switch K, across a strong a.c. source as above. Switch K is closed and after some time it is opened. Explain why a spark occurs at the switch. (3)
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SECTION D
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8. (a) Define terminal p.d<\/em> of a battery and one volt<\/em>. (2)
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(b) Derive the expression for electrical energy dissipated in a resister of resistance, R<\/em>, when a p.d of, V<\/em>, is maintained across it for a time, t<\/em>. (3)
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(c)
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Figure above shows a network of resistors of 3\u2126, 9\u2126 and 6\u2126, connected to a battery of 12V and internal resistance 0.5\u2126.
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Find: (i) Voltmeter reading. (3)
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(ii) power generated by the battery in 2minutes. (3)
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(d) (i) Describe how the e.m.f of a thermal couple can be determined using a potentiometer.(4)
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(ii) Explain one advantage of a potentiometer over an ordinary voltmeter in measurement of voltages. (2)
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(e) A wire has resistance of 52.3\u2126 at 400<\/sup>C and 54.4\u2126 at 1000<\/sup>C. Calculate its temperature coefficient of resistance. (3)
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9. (a) (i) State Coulomb’s law of electrostatics. (1)
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(ii)
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Figure above shows three charges of +7.9\u03bcC, -3.4\u03bcC, +5.4\u03bcC and +2.5\u03bcC, are arranged on a rectangle. Find the force acting on the 2.5\u03bcC charge. (6)
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(b) (i) Explain how a conductor can be charged negatively by induction. (3)
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(ii) Explain how the presence of a neutral conductor near a negatively charged material can affect the potential of the material. (3)
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(iii) Describe how a gold leaf electroscope can be used to detect charge an a body. (3)
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(c) Describe how a large potential is can be built in a van de Graff generator (4)
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10. (a) (i) Define relative permittivity<\/em> and dielectric strength<\/em>. (2)
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(ii) Describe an experiment to determine how capacitance of a capacitor varies with area of overlap of the plates. (4)
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(b) Two identical capacitors are connected in parallel and then charged to a p.d, V. The capacitors are then disconnected from the battery. Show that when a dielectric of constant, is inserted between the plates, the pd across the capacitors reduces by V. (3)
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(c)
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Four capacitors of 2\u03bcF, 3\u03bcF, 4\u03bcF and 6\u03bcF are connected in a network as above across a battery of e.m.f 6V. Find the:
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(i) Charge stored in the network. (4)
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(ii) p.d across the 4\u03bcF capacitor. (3)
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(d) A capacitor is connected in series with a micro ammeter to a d.c voltage source through a switch. When the switch is closed the micro ammeter pointer deflects in one direction then it comes to zero. When a dielectric is now inserted between the capacitor plates, the pointer again deflects then it comes to zero. Explain this observation. (4)
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\n\t\t<\/span>\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

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MAKTABA EDUCATION CENTER\" \/>\n<meta property=\"og:description\" content=\"P510\/2 PHYSICS PAPER 2 July\/August 2019 21\/2hours UGANDA ADVANCED CERTIFICATE OF EDUCATION JOINT MOCK EXAMINATIONS 2019 PHYSICS PAPER TWO P510\/2\" \/>\n<meta property=\"og:url\" content=\"https:\/\/edu.co.tz\/notes\/uace-physics-paper-two-joint-mock-examinations-2019\/\" \/>\n<meta property=\"og:site_name\" content=\"MAKTABA EDUCATION CENTER\" \/>\n<meta property=\"article:published_time\" content=\"2023-04-01T12:41:51+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-04-01T12:21:19+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042222_0927_UACEPHYSICS1.png\" \/>\n<meta name=\"author\" content=\"solvefor2\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"solvefor2\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/edu.co.tz\/notes\/uace-physics-paper-two-joint-mock-examinations-2019\/\",\"url\":\"https:\/\/edu.co.tz\/notes\/uace-physics-paper-two-joint-mock-examinations-2019\/\",\"name\":\"UACE PHYSICS PAPER TWO JOINT MOCK EXAMINATIONS 2019 - 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